import 'package:flutter/material.dart';

void main() {
  runApp(const MaterialApp(home: Main()));
}

class Main extends StatefulWidget {
  const Main({super.key});

  @override
  _MainState createState() => _MainState();
}

class _MainState extends State<Main> {
  @override
  Widget build(BuildContext context) {
    return Center(
        child: Container(
            //color: Colors.black38,
            width: 200,
            height: 200,
            // EdgeInsets.all 四个方向
            padding: const EdgeInsets.all(10),
            // formLTRB 按照 左上右下设置
            // padding: const EdgeInsets.fromLTRB(10, 20, 30, 40),
            // only 可以只设置一个方向
            // padding: const EdgeInsets.only(left: 20),
            decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(10),
                color: Colors.blueAccent,
                border: Border.all(width: 10)),
            child: Container(
              // 如果不设置宽高，默认占满父容器
              color: Colors.amber,
              // margin: const EdgeInsets.only(left: 10, right: 20),
              // vertical 设置上下 horizontal 设置左右
              child: const Text(
                'hello world',
                style: TextStyle(fontSize: 20),
              ),
            )));
  }
}
